Weighing-scale attachment.



No. 665,762. Patented Ian. 8, |90l. J. C. TARVIN.

WEIGHING SCALE ATTACHMENT.

(Application led Apr. 20, 1900.)

'(No Model.)

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UNITED STATES PATENT OFFICE.

.IOIINCOGLE TARVIN, OF HOLLIT SPRINGS, MISSISSIPPI, ASSIGNOR 'lO THE NATIONAL COMPUTING SCALE COMPANY, OI" CLEVELAND, OHIO.

WElGHlNG-SGALE ATTACH WIENT.

.clEECGAfON forming part of Letters :Patent No. 665,762, dated January 8, 1901.

Application filed April 20, 1900. Serial No. 13,628. (No model.)

.To @ZZ whom it may concern: of his profit on his transaction. My attach Be it known that I, JOHN COGLE TARVIN, ment warns the salesman when he is near of Holly Springs, in the county of Marshall the required amount, and the result is that and State of Mississippi, have invented a new he s-lackens up the discharge and does not 55 and useful Improvement in Weighing-Scale putin too milch. Again, if the store-room Attachments, of which the followingisaspecishould be a little dark, as is frequently the lcation. case, the weigher could not see the beam, as Myinvention is in the nature of a device to it slips u p gently, and again too much goods be applied to weighing-scales for the purpose would be delivered, or the salesman may 6o 1o of sounding an audible signal a short time have his attention attracted from his scales before the full amount of the material is deand too much goes into the scales and must posited into the scales, so that the salesman be taken out again. may not put in too much and be obliged to My invention for overcomingthese difficultake it out again, but is notified in time to ties consists in a simple little attachment, 65 slacken or reduce the rate of discharge from which I will now proceed to describe with the scoop into the scale. reference to the drawings, in which- It a grocer is asked by his customer for iive Figure l is a side View of the device, and pounds of coffee, the grocer pours his goods Fig. 2 a cross-section on line 2 2. into the scoop or paper bag until the scale In the drawings the numeral l is a barrel 7o 2o balances, and it requires much time and paor cylindrical casing containing an ordinary tience in most cases to balance the scales, clock-spring attached at one end to the windyet to justify both the seller and the buyer ing-shaft bearing the key l() and at the other the scales must be balanced perfectly. The end to the barrel or casing, so as to turn il in greatest obstacle in the wayof obtaining this the direction of the arrow. This barrel or 75 balance is in putting in too much goods and casing has a series of projecting pins 14 on then having to take some of it out of the scales its side and a ratchet-wheel on its periphery in order to make it balance. Taking the engaged witha vibrating pallet-escapement2, goods out requires time, and it impresses the mounted on pivots at ll and having'a rigidlycustomer as a bit of stingy eXactness, since attached arm i3 on one side and a shorter 3o he does not always understand that the overone 4 on the other. The arm d is held down weight comes entirely out of the merchants by a helical spring adjusted as to tension profit, which is thus seriously impaired. The by a subjaeen t screw 6. In suitable bearings proper thing to do, therefore, is to guard in brackets there is pivoted an oscillating against putting in too much in the iirst place, rock-shaft 7, which extends at right angles 85 and then the time will be saved and the disthrough the frame-plates. 'lhisrock-shaft has agreeable impression on the customer is on one side of the said frame-plate a hammeravoided. My invention is designed to proarm l5, adapted to strike against-abel] 16, and vide an attachment which will notify the opon the other side of the frame-plate it has a erator when he is within one ounce7 two rigid arm 8, that is drawn down by a helical 9o 4o ounces, three ounces, or any amount the maspring 9 and is made to bear against the circuchine is set for of the required amount, the lar series of pins 14 on the side of the barrel or instrument being adjustable to any amount easing. Then this barrel or casing revolves, desired. The salesman ordinarily has not its series of pins 14 acting upon the arm S the least idea when his scale-beam is going lifts it against the tension of the spring9 and 95 to move up until it starts from the bottom. causes the ham mer-arm to be vibrated in con- Then as he is pouring in goods there must tact with the bell. The starting of the alarm necessarily be some goods in the air between bell is effected by a relief from the pressure the scoop and the scales when the beam of the scale-beam B against the long arm 13, starts, which material when it reaches the which is lifted by spring 5 at the initial move- Ioo 5o scales proves to be overweight. Then the ment of the scale-beam. This occurs a little salesman must take it out or lose a portion before the full amount of goods is deposited,

and it releases the escapement 2 and allows the spring-barrel to rotate.

In the operation of my signal the arm 13 will contact with the scale-beam at right angles to it and near the end and on the under side of the beam, so as not to interfere with the sliding poise or the placing of the weights on the saine. When the poise is moved out on the scale-beam, the weight of the beam forces down the arm 13, and the bell does not then ring. `When, however, the goods are being placed on the scale, the beam is being lightened. Just as soon as the beam is lightened sufficiently for the arm 13 (as adjusted) to lift the beam the least bit the escapement acts and gives the ring on the bell. rlhe arm 8 is so arranged that it slips off of one of the little pins 11i atevery second eseapemennthus giving a ring only as the arm 13 goes up or when it is wanted, and not when the scalepoise is being placed in position for some certain amount.

The instrument is adjusted to give alarm at different quantities by regulating the tension of spring 5 through adjusting-screw 6.

The whole apparatus is to be inclosed in an aluminium case or a case of some neat suitable material, and only the point of arm 13 and adjusting-screw 6 will be exposed outside of the case.

To render the balance more sensitive, l propose to use as a substitute or in addition to the set-screw G and spring 5 an adjustable weight 17, which is itied upon a screwthreaded portion of the arm 13 or i and is adjusted back or forth by being turned like a nut.

In rendering my invention more clear and distinctive I would state that the lifting influence of the arm 13 on the scale-beam B does not falsify the scales or interfere with the accuracy of the scales, as might appear at first glance, for the reason that the rise of the arm 13 is limited to about one-eighth ol' an inch only and it does not follow the beam up to its balanced or weighing position, as the end of the beam rises ordinarily about threequarters of an inch or more. My alarm is set off by the initial movement of the scale-beam only, and then to secure the balance in correct weighing the scale-beam leaves the arm 13 and rises to its higher balanced position of accurate weighing. It is obvious that if this were not so the whole purpose of my invention would be defeated, which is to give the alarm in advance of correct weighing, so that the pouring in of the material may be checked and graduated nicely up to the point of correct weighing. This distinguishes m y in vention from other devices in which a signal sounded after a correct balance is attained or after an overweight has been placed on the scales. lt is obvious that in suoli case the purposes and objects of my invention could not be attained and its advantages are entirely lost.

Having thus described my invention, what l claim as new, and desire to secure by Letters Patent, is-

1. The combination with a movable scalebeam in a weighing-scale; of a bell, a hammer-vilnating mechanism, and an escapement having a releasing-arm extended to a position below the scale-beam when the latter is in its lowerrnost position, said arm being arranged to rise with the scale-beam through the initial portion oil its upward movement only, substantially as described.

2. The combination with a movable portion of a weighing-scale; ol' a spring-motor, a bellhammer-vibrating mechanism, and an escapement arranged to be released by the movable portion of the scales at its initial movement and before reaching its balanced position substantiallv as described.

3. The combination with a movable scalebeam in a weighing-scale; of a bell, a hammer-vibrating mechanism,and an cscapement having a releasing-arm extended to a position below the scale-beam when the latter is in its lowest position, said arm being arranged to rise with the scale-beam through the initial portion of its upward movement only, and an adjusting device for regulating the sensitiveness of the upward pressure ol' the releasingarm on the scale-beam, substantially as and for the purpose described.

et. The combination with the movable portion of a pair of scales; of a barrel containing an actuating-spring with ratchet-wheel on its periphery and projecting pins on its side, a bell, and bell-hammer with spring for moving it in one direction and an arm engaging with the projecting pins, and a pallet-escapement with arms one of which is provided with a tension-spring and regulating-screw substantially as and for the purpose described.

1n testimony whereoly l have signed my name to this specification in the presence of two subscribing` witnesses.

JOHN @OGLE TARVIN.

Witnessesz Guo. C. MYERS, G1-ms. H. WRIGHT.

IOC 

